A B C D E F G H I J K L M N O
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  1 └┴┴┴┴┴┴┴┴┴┴┴┴┴┘ 

[ 1]● ==> H8   [ 2]○ ==> I9   [ 3]● ==> J6   [ 4]○ ==> G9   [ 5]● ==> J8
[ 6]○ ==> H9   [ 7]● ==> J9   [ 8]○ ==> J7   [ 9]● ==> I8   [10]○ ==> G8
[11]● ==> I5   [12]○ ==> K7   [13]● ==> K8   [14]○ ==> L8   [15]● ==> I10
[16]○ ==> L7   [17]● ==> I7   [18]○ ==> M7   [19]● ==> N7   [20]○ ==> K9
[21]● ==> J10  [22]○ ==> L6   [23]● ==> L5   [24]○ ==> K5   [25]● ==> J4
[26]○ ==> O11